How to get the mysterious Isu bow in Assassin's Creed Valhalla

Conquer Britain with these Assassin's Creed Valhalla guides

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AC Valhalla romance: Find love in Dark Ages Britain
AC Valhalla armor: The best of Britain
AC Valhalla Hidden Ones Bureaus: Find Codex Pages
AC Valhalla Zealots locations: All murder spots
AC Valhalla choices: What you should decide
AC Valhalla Thor: How to get Mjolnir, and more

Want to know how to get the AC Valhalla Isu bow? The Nodens' Arc mythical hunter bow is one of...